1
James Ronald Booth, Donald Reid Bush, John Thomas Fessler, Keith Bryan Hardin: Spread spectrum clock generator and associated method. Lexmark International, John A Brady, February 16, 1999: US05872807 (54 worldwide citation)

A clock circuit includes an oscillator for generating a reference frequency signal, and a spread spectrum clock generator cooperating with the oscillator for generating a spread spectrum clock output signal having a fundamental frequency and reduced amplitude EMI spectral components at harmonics of ...


2
Keith Bryan Hardin, Craig Eric Hadady: Method and apparatus for compensating a spread spectrum clock generator. Lexmark International, John A Brady, September 18, 2001: US06292507 (49 worldwide citation)

An improved spread spectrum clock generator circuit is provided which automatically compensates for variations in passive component values and system gain and charge pump current in a Phase Locked Loop circuit. The pulse widths of the UP and DOWN outputs of the Phase Frequency Detector are monitored ...


3
John Thomas Fessler, Keith Bryan Hardin, Mark Stephen Underwood: Systems and methods for determining physical location of RFID tags on embedded print media. Lexmark International, Lexmark International, May 29, 2007: US07223030 (24 worldwide citation)

A printing system (250) includes a printing subsystem (255) in the form of a printer assembly (14). The printing subsystem (255) includes a printer housing (257) in which a print engine (259) resides and a memory (261) for storing data indicating the position of labels on media. The contents of memo ...


4
Keith Bryan Hardin, Robert Aaron Oglesbee: Segmented spectrum clock generator apparatus and method for using same. Lexmark International, John A Brady, June 11, 2002: US06404834 (20 worldwide citation)

A segmented spectrum clock generator is provided that exhibits a frequency response having multiple segments that with a sharp rolloff on both sides of each individual segment's peak amplitude across the entire frequency spectrum. In order to meet proposed new CISPR-22 rules, each segment must ...


5
James Ronald Booth, Donald Reid Bush, John Thomas Fessler, Keith Bryan Hardin: Spread spectrum clock generator and associated method. Lexmark International, John A Brady, February 2, 1999: US05867524 (19 worldwide citation)

A clock circuit includes an oscillator for generating a reference frequency signal, and a spread spectrum clock generator cooperating with the oscillator for generating a spread spectrum clock output signal having a fundamental frequency and reduced amplitude EMI spectral components at harmonics of ...


6
Keith Bryan Hardin: Variable spread spectrum clock. Lexmark International, John A Brady, December 26, 2000: US06167103 (18 worldwide citation)

A digital spread spectrum clock circuit is made variable by employing RAM memory (29), and a multiplexer (39) to receive initiation data before the circuit is ready to run normally. A second counter (17) and an adder (25) each receiving the contents of programmable registers (17 and 25) permit wide ...


7
Keith Bryan Hardin, Robert Aaron Oglesbee, Brian Keith Owens: Method and apparatus for providing multiple spread spectrum clock generator circuits with overlapping output frequencies. Lexmark International, Frederick H Gribbell, John A Brady, December 2, 2003: US06658043 (14 worldwide citation)

A multiple output spread spectrum clock circuit is provided that reduces electromagnetic emissions when two different clocks operate at frequencies which overlap one another. Two such clock circuits are controlled so as to introduce a phase difference between the clocks as they operate through their ...


8
John Thomas Fessler, Keith Bryan Hardin, Eric Wayne Westerfield: Printed circuit board having outer power planes. Lexmark International, Coats & Bennett PLLC, March 21, 2006: US07016198 (7 worldwide citation)

A multi-layer printed circuit board (PCB) routes signal traces on internal signal layer(s) and includes power planes on the two outermost layers. The outer layers are maintained at the same non-ground voltage level, and are electrically connected by a series of vias that circumscribe signal traces o ...


9
Chris Anthony Burdette, Keith Bryan Hardin, Mark Stephen Underwood, Terry Lee Wells: Apparatus and methods of detecting print media orientation. Lexmark International, Grossman Tucker Perreault & Pfleger PLLC, March 6, 2007: US07187294 (6 worldwide citation)

A radio frequency signature (88) on a cut sheet of print media (28) is detected by a radio frequency interrogating device (94) to determine whether the print media (28) is properly oriented. The leading edge (124) or trailing edge (126) of the print media (28) is detected by one or more print media ...


10
Chris Anthony Burdette, Keith Bryan Hardin, Mark Stephen Underwood, Terry Lee Wells: Apparatus and methods of detecting relative position of RF signature on print media. Lexmark International, Grossman Tucker Perreault & Pfleger PLLC, July 31, 2007: US07249819 (4 worldwide citation)

The presence of a radio frequency signature (88) on a cut sheet of print media (28) is detected by a radio frequency interrogating device (94) to determine it's relative left/right position on the print media (28). Either the leading edge (124) or trailing edge (126) of the print media (28) is detec ...